/*
 * @(#)${NAME}
 *
 * Copyright 2002 - 2004 JIDE Software Inc. All rights reserved.
 */
package com.element.plaf.metal;

import com.element.plaf.basic.BasicPainter;
import com.element.plaf.basic.ThemePainter;

import javax.swing.*;
import javax.swing.plaf.metal.MetalLookAndFeel;
import java.awt.*;

/**
 * Painter for Metal L&F.
 * <p/>
 * Please note, this class is an internal class which is meant to be used by other JIDE classes only. Future version
 * might break your build if you use it.
 */
public class MetalPainter extends BasicPainter {

	private static MetalPainter _instance;

	public static ThemePainter getInstance() {
		if (_instance == null) {
			_instance = new MetalPainter();
		}
		return _instance;
	}

	public MetalPainter() {
	}

	@Override
	public void paintGripper(JComponent c, Graphics g, Rectangle rect, int orientation, int state) {
		if (orientation == HORIZONTAL) {
			MetalBumps bumps = new MetalBumps(rect.width, rect.height - 6,
					state == ThemePainter.STATE_SELECTED ? MetalLookAndFeel.getPrimaryControlHighlight() : MetalLookAndFeel.getControlHighlight(),
					state == ThemePainter.STATE_SELECTED ? MetalLookAndFeel.getPrimaryControlDarkShadow() : MetalLookAndFeel.getControlDarkShadow(),
					null);
			bumps.paintIcon(null, g, rect.x, rect.y + 3);
		} else {
			MetalBumps bumps = new MetalBumps(rect.width - 6, rect.height,
					state == ThemePainter.STATE_SELECTED ? MetalLookAndFeel.getPrimaryControlHighlight() : MetalLookAndFeel.getControlHighlight(),
					state == ThemePainter.STATE_SELECTED ? MetalLookAndFeel.getPrimaryControlDarkShadow() : MetalLookAndFeel.getControlDarkShadow(),
					null);
			bumps.paintIcon(null, g, rect.x + 3, rect.y);
		}
	}

	@Override
	public void paintDockableFrameTitlePane(JComponent c, Graphics g, Rectangle rect, int orientation, int state) {
		boolean isSelected = state == STATE_SELECTED;

		int width = rect.width;
		int height = rect.height;

		Color background = isSelected ? MetalLookAndFeel.getWindowTitleBackground() : MetalLookAndFeel.getWindowTitleInactiveBackground();
		String gradientKey = isSelected ? "InternalFrame.activeTitleGradient" : "InternalFrame.inactiveTitleGradient";
		if (!drawGradient(c, g, gradientKey, 0, 0, width, height, true)) {
			g.setColor(background);
			g.fillRect(0, 0, width, height);
		}
	}

	//
	// Ocean specific stuff.
	//

	/**
	 * Draws a radial type gradient. The gradient will be drawn vertically if <code>vertical</code> is true, otherwise
	 * horizontally. The UIManager key consists of five values: r1 r2 c1 c2 c3. The gradient is broken down into four
	 * chunks drawn in order from the origin. <ol> <li>Gradient r1 % of the size from c1 to c2 <li>Rectangle r2 % of the
	 * size in c2. <li>Gradient r1 % of the size from c2 to c1 <li>The remaining size will be filled with a gradient
	 * from c1 to c3. </ol>
	 *
	 * @param c        Component rendering to
	 * @param g        Graphics to draw to.
	 * @param key      UIManager key used to look up gradient values.
	 * @param x        X coordinate to draw from
	 * @param y        Y coordinate to draw from
	 * @param w        Width to draw to
	 * @param h        Height to draw to
	 * @param vertical Direction of the gradient
	 * @return true if <code>key</code> exists, otherwise false.
	 */
	static boolean drawGradient(Component c, Graphics g, String key,
	                            int x, int y, int w, int h, boolean vertical) {
		Object colors = UIManager.get(key);
		if (!(colors instanceof java.util.List gradient)) {
			return false;
		}

		if (gradient == null || !(g instanceof Graphics2D)) {
			return false;
		}

		if (w <= 0 || h <= 0) {
			return true;
		}

		GradientPainter.INSTANCE.paint(
				c, (Graphics2D) g, gradient, x, y, w, h, vertical);
		return true;
	}

	// copy from MetalUtils but removed most of the caching feature
	private static class GradientPainter {
		/**
		 * Instance used for painting.  This is the only instance that is ever created.
		 */
		public static final GradientPainter INSTANCE = new GradientPainter();

		GradientPainter() {
			super();
		}

		public void paint(Component c, Graphics2D g,
		                  java.util.List gradient, int x, int y, int w,
		                  int h, boolean isVertical) {
			int imageWidth;
			int imageHeight;
			imageWidth = w;
			imageHeight = h;
			synchronized (c.getTreeLock()) {
				paint(c, g, imageWidth, imageHeight, gradient, isVertical);
			}
		}

		protected void paint(Component c, Graphics g, int w, int h, java.util.List gradient, boolean isVertical) {
			Graphics2D g2 = (Graphics2D) g;
			// Render to the VolatileImage
			if (isVertical) {
				drawVerticalGradient(g2,
						((Number) gradient.get(0)).floatValue(),
						((Number) gradient.get(1)).floatValue(),
						(Color) gradient.get(2),
						(Color) gradient.get(3),
						(Color) gradient.get(4), w, h);
			} else {
				drawHorizontalGradient(g2,
						((Number) gradient.get(0)).floatValue(),
						((Number) gradient.get(1)).floatValue(),
						(Color) gradient.get(2),
						(Color) gradient.get(3),
						(Color) gradient.get(4), w, h);
			}
		}

		private void drawVerticalGradient(Graphics2D g, float ratio1,
		                                  float ratio2, Color c1, Color c2,
		                                  Color c3, int w, int h) {
			int mid = (int) (ratio1 * h);
			int mid2 = (int) (ratio2 * h);
			if (mid > 0) {
				g.setPaint(getGradient((float) 0, (float) 0, c1, (float) 0,
						(float) mid, c2));
				g.fillRect(0, 0, w, mid);
			}
			if (mid2 > 0) {
				g.setColor(c2);
				g.fillRect(0, mid, w, mid2);
			}
			if (mid > 0) {
				g.setPaint(getGradient((float) 0, (float) mid + mid2, c2,
						(float) 0, (float) mid * 2 + mid2, c1));
				g.fillRect(0, mid + mid2, w, mid);
			}
			if (h - mid * 2 - mid2 > 0) {
				g.setPaint(getGradient((float) 0, (float) mid * 2 + mid2, c1,
						(float) 0, (float) h, c3));
				g.fillRect(0, mid * 2 + mid2, w, h - mid * 2 - mid2);
			}
		}

		private void drawHorizontalGradient(Graphics2D g, float ratio1,
		                                    float ratio2, Color c1, Color c2,
		                                    Color c3, int w, int h) {
			int mid = (int) (ratio1 * w);
			int mid2 = (int) (ratio2 * w);
			if (mid > 0) {
				g.setPaint(getGradient((float) 0, (float) 0, c1,
						(float) mid, (float) 0, c2));
				g.fillRect(0, 0, mid, h);
			}
			if (mid2 > 0) {
				g.setColor(c2);
				g.fillRect(mid, 0, mid2, h);
			}
			if (mid > 0) {
				g.setPaint(getGradient((float) mid + mid2, (float) 0, c2,
						(float) mid * 2 + mid2, (float) 0, c1));
				g.fillRect(mid + mid2, 0, mid, h);
			}
			if (w - mid * 2 - mid2 > 0) {
				g.setPaint(getGradient((float) mid * 2 + mid2, (float) 0, c1,
						w, (float) 0, c3));
				g.fillRect(mid * 2 + mid2, 0, w - mid * 2 - mid2, h);
			}
		}

		private GradientPaint getGradient(float x1, float y1,
		                                  Color c1, float x2, float y2,
		                                  Color c2) {
			return new GradientPaint(x1, y1, c1, x2, y2, c2, true);
		}
	}
}


